Revolver.



JAMES I). ROBERTSON, OF NORWICH,

EETCEa PATENT CONNECTICUT, AssIeNoR, nv MESNE ASSIGNMENTS, TO THE THAMES ARMS COMPANY, OF NORWICH, CON- NECTICUT A CORPORATION.

R LEv o Lv E R.

SPECIFICATION forming part of Letters Patent N o. 708,078, dated September 2, 1,902. Application filed November 4, 1901. Serial No. 80,974. (No model.)

To zr/ZZ whom it may concern:

Be it known that JAMES D. ROBERTSON, a Citizen ofthe United States, residing at Norwich, in the county of New London and State of Connecticut,have invented certain new and useful Improvements in Revolvers, of which the following is a full, clear, and exact description.

This invention is in so-called breakdown ro or y hinge revolvers; and my im mediate purpose is to provide simple, cheap, and effective means for removably attaching the cylinder to the barrel. I

The drawings annexed hereto illustrate my f5 said invention, Figure l being a side elevation of the barrel of a hinge-revolver having mounted therein a cylinder-retaining device of my newly-invented form, and Fig. 2 is a central longitudinal sectional view'of a cylinzo der adapted to vCoperate with the said retaining device. barrel and Cylinder assembled.

In thedrawings theletteroindicates the barrel, and b the cylinder, of a revolver. e 5 in the barrel and projecting rearward therefrom is a tubular axial stein c, whose free end is split, as at c', and is also provided with a slight enlargement in the form of an annulus c2. The cylinder is bored centrally, as at 3o b', to provide an opening that will readily receive the-body portion of the axial stem c, and within said opening is an annular channel b2, of such size and so located that when the cylinder is mounted upon the axial stem c the annulus c2 will lie in the described channel b2, and thus prevent endwise displacement of the cylinder relatively to the stem under ordnary conditions. W hen the cylininder is forced upon the stem, the split end 4o of thelatter is compressed and constricted until the annulus c2 reaches and expands into the annular chamber b2. The cylinder may then be revolved upon the axial stem by the In Fig. 3 I have shown the said y Fixed usual pawl Carried by the hammer, (notshown in the drawings,) the expansive tendency of the split stem providing a degree of frictional resistance suiiicientl to prevent the -cylinder from revolving,r too freely. Meanwhile the Coperatingannulus C2and channelb2 prevent the accidental endwise displaceement ofthe 5c ycylinder on the stem; but in the event that it becomes necessary to remove the cylinder for cleaning or other purposes it may be done by drawing the cylinder rearward with sufficient force to contract the split end of the A stern.

' My described cylinder-retaining device is entirely concealed from view when in use and can be provided at a much less cost than any of the other retaining devices with which 6o I am familiar.

Having thus described my invention, I claimf 1. In combination, a cylinder having a central axial opening with annular enlargement, as set forth, a barrel, and an axial stem xed s in said barrel; the free end portion of said stem being slotted and provided with an anc nulus adapted to enga-ge the said annular enlargement in the cylinder. 7o 2. The combination with a cylinder having A- an axial opening with annular enlargement between its ends, of a barrel having a fixed axial stem of less length than saidopening and provided with slotted outer end with an 75 annulus` at the end of the slots to spring .into l said enlargement of the bore of the cylinder to prevent displacement of the latter without retarding its rotation, substantially as described.

Signed at Norwich, Connecticut, this 23d day of October, 1001.

JAMES D. ROBERTSON.

Witnessesi FRANK I-l. ALLEN,

FRANK S. DEWIRE. 

